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Fractal Design Define S Black Silent ATX Midtower Computer Case

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  • Steel ATX Mid Tower
  • Optimally designed for silent computing with high density noise-reducing material throughout
  • Patent pending ModuVent design, allowing the user to either have optimal silence or optimal airflow
  • Supports up to 4 radiators (1 X 420/360/280/240mm, 1 X 360/280/240mm, 1 X120mm & 1 X 140/120mm)
  • Included Liquid cooling Reservoir mounting brackets
  • Removable Dust Filters
  • 2x USB3.0 Audio In/Out Front Ports

  • Overview
  • Specs
  • Warranty & Returns
  • Reviews


The Fractal Design Define S lends the appearance, sound dampening technology, and support for a wide variety of components from the widely popular Define Series, while introducing a new, innovative internal layout. The Define S case is packed with intelligently designed enthusiast-oriented features delivering a silent case with powerful and expansive air and liquid cooling support, presented in a stunning Scandinavian inspired construction.

The modernized internal layout of the Define S omits the optical drive bays, instead focusing on a clear straight airflow path and uncompromising water cooling support.

The Define S case reaches the highest level of silent computing through strategically placed dense sound-absorbing material, multiple ModuVent™ fan vent covers and finely tuned Dynamic Series fans.



Key features

  • Optimally designed for silent computing, while not compromising on airflow and cooling capabilities
  • Innovative internal layout, providing a perfectly straight airflow path to the CPU heatsink for air cooling set ups or extensive radiator mounting possibilities for water cooling set ups
  • Extensive water cooling support for a case of this size; housing radiators up to 420mm in the top and 360mm in the front
  • Including smart reservoir brackets; featuring drill-free reservoir mounting on the front of the motherboard tray and pre-drilled pump mounting holes on the bottom panel
  • Equipped with ModuVent™ fan slot covers providing the option of additional cooling or maximum sound absorption
  • Including two Fractal Design Dynamic GP14 140mm fans developed for superlative airflow while still maintaining low noise levels
  • Maintaining a dust-free interior with dust filters that cover the front and bottom air intakes
  • Introducing newly designed hard drive trays placed vertically behind the front partition of the motherboard tray; Three sturdy steel trays with vibration-dampening grommets allowing for installation of one 3.5" or 2.5" drive on each tray, without disrupting the airflow or interfering with the radiator mounting possibilities
  • An additional 2 dedicated steel SSD trays cleanly placed behind the motherboard tray
  • Long motherboard tray extending to the front panel contributing to an extremely clean build, hiding both hard drives and cables
  • Define S model is also available with a large window on the side panel


  • ATX, Micro ATX, Mini ITX motherboard compatibility
  • 7 expansion slots
  • 3 - 3.5" HDD positions (can also accommodate 2.5" units); 2 - 2.5" dedicated SSD/HDD unit positions
  • 9 - Fan positions (2 Fractal Design Dynamic GP14 140mm fans included); 8 fan positions on window model
  • Filtered fan slots in the front and bottom
  • CPU coolers up to 180mm in height
  • ATX PSUs up to 180/170 mm with a bottom 120/140mm fan installed; When not using any bottom fan location longer PSUs up to 300mm can be used
  • Graphics cards up to 425 mm in length with front fans installed, without compromising HDD capacity; Graphics cards up to 450mm in length without front fans installed directly in line with the GPU
  • With a front radiator, maximum graphics card length is reduced by the radiator thickness
  • 20 - 40 mm of space for cable routing behind the motherboard plate
  • Velcro straps included for easy cable management
  • Both side panels feature smart captive thumbscrews so no thumbscrews are lost
  • Colours available: Black
  • Case dimensions (WxHxD): 233 x 451 x 520mm
  • Case dimensions - with feet/screws/protrusions: 233 x 465 x 533mm
  • Net weight - window version: 9.1 kg
  • Package dimensions (WxHxD): 322 x 615 x 535mm
  • Package weight - window version: 10.8 kg

Cooling system

  • Front: 3 – 120/140 mm fans (included is 1 Fractal Design Dynamic GP14 fan, 1000 RPM speed)
  • Rear: 1 – 120/140 mm fan (included is 1 Fractal Design Dynamic GP14 fan, 1000 RPM speed)
  • Top: 3 - 120/140 mm fan (not included) or 1 - 180 mm fan with 165mm hole spacing (not included)
  • Bottom: 1 – 120/140 mm fan (not included)
  • Dust filters: Bottom and front intakes

Water cooling compatibility - Radiators

  • Front – 360, 280, 240, 140 and 120 mm radiators of all thicknesses
  • Top – 420, 360, 280, 240, 140 and 120 mm radiators. (A thickness limitation of 55mm for both radiator + fan applies on 420, 280 and 140 mm radiators)
  • Bottom – 120 mm radiator (Use of radiators in the bottom position limits the PSU length to 165 mm)
  • Rear – 120 or 140 mm radiator

Water cooling compatibility - Pumps

  • Pre-drilled holes on the bottom panel, supports many DDC and D5 variants

Water cooling compatibility - Reservoirs

  • Adjustable mounting brackets allow for almost any rectangular mounting screw pattern
  • Maximum distance between the mounting bracket screw positions: 350mm height / 80mm width

Front interface

  • 2 USB 3.0
  • Audio in/out
  • Power button with LED (blue)
  • HDD activity LED (blue)
  • Reset button

Package contents

  • Define S (Non-window) computer case
  • User manual
  • Accessory box

Learn more about the Fractal Design FD-CA-DEF-S-BK

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details
  • Return Policies
    • Return for refund within: 30 days
    • Return for replacement within: 30 days
  • This item is covered by's Standard Return Policy.
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Great box! 5/14/2019 11:45:57 AM

Pros: Extremely quiet. Lots of room inside. Easy access portals to position connections. Solid construction.

Cons: None

Overall Review: If I were to do another build, I would purchase this case again.

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Ownership: 1 month to 1 year
Verified Owner
4/ 5
Great case for those neat freaks! 5/7/2019 12:01:12 PM

Pros: This is a well built case with lots of great features. Fist off is wire management. They did a great job here. High quality velcro straps throughout. Well positioned case fan inserts allow for a multitude of options as well as water cooling.

Cons: I only have one thing to complain about and that's the wish for a little more room but it's my fault for not buying the next size up so nothing on the manufacturer side.

Overall Review: Definitely recommend this to someone looking for a sleek well designed case.

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Ownership: 1 day to 1 week
Verified Owner
2/ 5
Lots of room 3/19/2019 5:49:14 PM

Pros: Looks great
No lights
Lots of space

Cons: Accessory Pack missing pieces

Overall Review: My "accessory pack" came with an improper amount of screws vs what appears on the contents, and did not contain any system board standoffs.

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Ownership: 1 week to 1 month
Verified Owner
3/ 5
Awesome case with issues though. 3/2/2019 8:24:23 AM

Pros: Every part I bought fit correctly

Plenty of Space

Sides panel easy to remove

Plenty of spots for fans.

5 Hard Drive Spots

Came with all the screws and zip ties needed.

Cons: 1 Usb slot on the case had a bent pin when it arrived.

The power button led doesn't turn on unless the computer goes to sleep.

If you want to see your RBGs on the board or any other components, do not buy this case.

Silicon Power SSD can't be mounted correctly because of the placement of where the power connector needs to be.

Overall Review: I'm not a great reviewer especially this being my first build but I wanted a case with plenty of space and easy installation. A clear side panel would be a cool addition to this case if it's an option because the inside of the case is well designed.

0 out of 3 people found this review helpful. Did you?
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Fantastic Case 2/6/2019 6:26:37 AM

Pros: - Packaged well
- Massive, great cable management, incredibly quiet

Cons: - None

Overall Review: - Paired with Intel Core i7-8086K Coffee Lake, CORSAIR Vengeance LPX 32GB (2 x 16GB) 288-Pin DDR4 SDRAM DDR4 2666, ASRock Z390 Taichi Ultimate LGA 1151 (300 Series) Intel Z390, Seasonic PRIME Ultra 750W 80+ Platinum Power Supply and SAMSUNG 970 PRO M.2 2280 512GB PCIe Gen3.
- Quiet, cool, and aesthetically pleasing if you're not into the RGB scene
- As usual, great pricing and shipping from Newegg

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Ownership: 1 week to 1 month
Verified Owner
5/ 5
Best case I have ever used or seen 2/1/2019 2:18:15 PM

Pros: Very nice build quality and great sound dampening on all sides. Wide open chamber allows for good airflow and expansion into liquid cooling. Honestly I have no idea why they even made an S2 because this one is just so good already. Cases no longer come with a side mount fan and I think that is just terrible. I chose this because it does have a mounting position for the fan. I have a fan that pulls air out there and it keeps my GPU 10 degrees cooler than otherwise without it. Plus when you give the air an avenue to escape the case the other components won't get as hot either. The front plate does not restrict airflow at all either.

Cons: Fans that came with it are ok at best. I swapped 1 noctua 120mm fan in place of the 2 140mm fans that came with it and it is quieter while performing better. I wish they just didn't come with it and instead discount the case. No USB 2 or USB c in the top is a pretty big oversight.

Overall Review: I highly recommend this case to anyone. It is the best value case I found after literally dozens of hours of searching.

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Ownership: more than 1 year
Verified Owner
4/ 5
Great case solid 4.5 for what I want 10/14/2018 1:29:45 PM

Pros: You can make this into a great dust controled case
Plenty of air flow
Plenty of space
Looks nice

Cons: No optical drive mount (I wouldn't want one in standard position anyway because it would block one of my fans)
Side window is plastic and I can't find the glass panel upgrade anywhere in U.S.A.
Bottom filter comes out the back...dumb dumb dumb....should come out the front!
No dust filter for top (if you remove sound proof panels)

Overall Review: I've had this case since 2016 and I love it...I would love it more if I could find the tempered glass side panel but alas I cannot find one in the USA. My case has a 240mm AIO as front intake, one more 120mm fan on front intake, bottom stock fan intake, rear stock fan exhaust. This setup works great. I use strategically placed painters tape to seal off any openings with the exception of the intake (front/bottom) and the exhaust.

Most cases have way too many holes, hex pattern vents, just letting tons of dust inside. One of the main reasons I got this case is because it has less holes in it and it is fairly easy to cover the holes it does have. My components stay cleaner than any other case I have had in the past. Temps while gaming: cpu 45-55 spike to 60 on occasion, gpu 30-36 maybe 40 on occasion (granted it's a beast of a card with 3 fans EVGA GTX 1080Ti FTW3 acts like a heat pump removing any hot air maybe, stays quiet rarely ever hear it, I do hear the Corsair AIO spin up when gaming).------------------BTW I tried top exhaust for the cooler and it doesn't work well so I moved back to front intake ....much MUCH better and more quiet too!

I often look at new flashy cases, tempted by the new fancy glass and lights but they always have too many entries for dust so I'll stick with this one ...just wish I could get the glass panel upgrade!

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Ownership: 1 month to 1 year
Verified Owner
5/ 5
The best case I've ever used 10/6/2018 6:23:02 PM

Pros: -Cable management is really easy in this case
-Moving the drives behind the MB opens up tons of space in the case and improves airflow
-Plenty of space for fans and/radiators
-Very quiet case fans
-Quality construction
-Cheaper than many cases that are of inferior design

Cons: Not really cons for me but might be for some people
-Not a lot of space for internal drives
-No mounts for internal CD/DVD/Blu-ray at all

Overall Review: I've been using this case for almost a year now and at this point, barring it being lost or destroyed in a move or something (in which case I would buy this case again), I can't imagine ever buying another computer case. I love it that much.

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